Universal Unit Tests aren't A Thing yet

Rx.NET/Source/Rx.sln

@@ -274,7 +274,6 @@ Global
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug8|Mixed Platforms.Build.0 = Debug8|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug8|x86.ActiveCfg = Debug45|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug81|Any CPU.ActiveCfg = Debug81|Any CPU
-		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug81|Any CPU.Build.0 = Debug81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug81|Mixed Platforms.ActiveCfg = Debug81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug81|Mixed Platforms.Build.0 = Debug81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Debug81|x86.ActiveCfg = Debug81|Any CPU
@@ -330,7 +329,6 @@ Global
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release8|Mixed Platforms.Build.0 = Release8|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release8|x86.ActiveCfg = Release45|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release81|Any CPU.ActiveCfg = Release81|Any CPU
-		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release81|Any CPU.Build.0 = Release81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release81|Mixed Platforms.ActiveCfg = Release81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release81|Mixed Platforms.Build.0 = Release81|Any CPU
 		{E7B7408B-B039-4F30-B6CF-CC06218CE4CA}.Release81|x86.ActiveCfg = Release81|Any CPU